package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 生产者
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        // 1.kafka的配置信息
        Properties properties = new Properties();
        // 连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.202.128:9092");
        // key和value的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        // 设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group1");
        // 2.创建消费者对象
        KafkaConsumer<String,String> consumer = new KafkaConsumer<String, String>(properties);
        // 3.订阅主题
        consumer.subscribe(Collections.singletonList("topic-first"));
        // 4.拉取消息
        // 自动提交偏移量
        /*
        while (true){
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.partition());
                System.out.println(consumerRecord.offset());
            }
        }
        */

        // 手动提交偏移量 同步
        /*
       while (true){
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.partition());
                System.out.println(consumerRecord.offset());
                try {
                    // 同步提交偏移量
                    consumer.commitSync();
                }catch (CommitFailedException e){
                    System.out.println("记录提交失败的异常"+e);
                }
            }
        }
        */

        // 手动提交偏移量 异步
        /*
        while (true){
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.partition());
                System.out.println(consumerRecord.offset());
            }
            // 异步的方式提交偏移量
            consumer.commitAsync(new OffsetCommitCallback() {
                @Override
                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                    if (e!=null){
                        System.out.println("记录异常的提交偏移量"+map+",异常信息为:"+e);
                    }
                }
            });
        }
        */

        // 手动提交偏移量 同步加异步
        try{
            while (true){
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                    System.out.println(consumerRecord.offset());
                }
                // 异步提交偏移量
                consumer.commitSync();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误的信息:"+e);
        }finally {
            // 同步提交偏移量
            consumer.commitSync();
        }


    }

}
